akashic
1876–2024
State Senate District 15·Illinois

Illinois 15th State Senate District has voted Democratic in ten straight presidential cycles.

One of Illinois's most reliably Republican state senate districts

1876 — 2024·38 elections
IL
Latest
D+31
in 2024
Archetype
Democratic loyalist
since the recent cycles
Population
474,016
2024 ACS

Illinois 15th State Senate District, Illinois: Democratic loyalist district. In 2024, voted D+31%. Republican peak: R+50 in 1920.

Key facts

2024 presidential margin
D+31MIT Election Lab
Political archetype
Democratic loyalistAkashic typology
Population
474,0162024 5-year
Median household income
$87,7702024 5-year
White (non-Hispanic)
47.9%2024 5-year
Black
20.1%2024 5-year
Hispanic / Latino
25.1%2024 5-year
Peak Democratic margin
D+45 in 2008MIT Election Lab
Peak Republican margin
R+50 in 1920MIT Election Lab
2024 results by constituent county
3 counties · 2 D · 1 R
R+60
D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonMarginDemocraticRepublicanTotal
D
+31.3%
126,77165,243196,424
D
+39.9%
149,65163,127216,801
D
+42.3%
137,40052,360200,892
D
+39.5%
127,96254,664185,577
D
+44.6%
140,51253,247195,774
D
+31.7%
120,96562,470184,571
D
+32.5%
106,20753,057163,667
D
+34.6%
94,08942,987147,689
D
+26.2%
99,93952,991179,197
D
+8.8%
89,82075,227166,455
R
−0.7%
88,03189,194178,284
D
+8.3%
88,41673,706176,744
D
+6.7%
94,13282,139179,589
R
−9.8%
82,812100,943184,790
D
+7.4%
91,24577,573185,028
D
+25.2%
120,05271,706191,758
D
+11.6%
107,00384,647192,192
R
−15.1%
75,281102,134177,853
R
−1.8%
90,11393,501184,111
D
+7.9%
92,70779,123172,903
D
+14.3%
97,03272,649170,177
D
+9.7%
89,92774,023164,587
D
+26.1%
95,82755,265155,692
D
+13.1%
71,49354,474130,137
R
−6.5%
55,75463,541120,221
R
−42.4%
17,26554,34187,429
R
−49.9%
15,33250,39370,325
R
−8.5%
29,67335,42667,714
O
+12.0%
10,3816,27934,313
R
−20.0%
12,09718,77433,307
R
−33.7%
8,12218,71631,408
R
−6.6%
14,64116,78432,284
R
−18.9%
12,16317,94330,555
D
+10.5%
11,6259,37321,478
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Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
10.7%
Irish
9.3%
Polish
7.6%
Italian
5.5%
English
4.0%
American
2.3%
French
1.1%
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 38.2 in this county, 39.1 nationally
Male
Age
Female
0.7%
85+
1.2%
1.9%
75–84
2.7%
4.3%
65–74
5.0%
6.0%
55–64
6.3%
6.3%
45–54
6.3%
6.9%
35–44
6.9%
7.5%
25–34
7.6%
4.4%
18–24
4.4%
8.3%
5–17
7.9%
2.8%
<5
2.7%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$87,770
State Senate District 15 ranks near the middle of US counties.
State Senate District 15$87,770
Illinois$83,390
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
12.4%
Children face moderate poverty.
Children under 1816.4%
Working age (18–64)11.1%
Seniors (65+)13.0%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
67.4%
speak English only
Spanish19.3%
Other Indo-European7.5%
Asian & Pacific Islander3.9%
Other languages1.9%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Catholic & Orthodox
28.5%
Non-Christian
6.6%
Other Christian
6.3%
Baptist
4.1%
Mainline Protestant
3.1%
Pentecostal & Holiness
2.3%
Methodist
1.1%
Source · 2020 US Religion Census. Remaining 48.0% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of R+31.7, this downstate district sits far outside Illinois's competitive range, reflecting the rural and small-city demographic patterns common to the state's southern and central regions.

The Democratic margin in Illinois 15th State Senate District reached its widest at forty-five points in 2008. The margin in 2024 was thirty-one points — still decisive.

Its loyalty is rooted in its place. Median household income of $87,770, a 48% non-Hispanic-white share, and a population of 474,016 together describe a district whose political habits are deeply settled.

Compare two places, side by side

Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →

Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
State Senate District 15, Illinois. Akashic. https://akashic.app/sld-upper/17015/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State Senate District 15, Illinois vote in 2024?
In 2024, State Senate District 15, Illinois voted Democratic by 31.3 points (D+31), carried by the Democratic candidate. Out of 196,424 votes cast, 126,771 went Democratic and 65,243 went Republican.
What is State Senate District 15, Illinois's political archetype?
Akashic classifies State Senate District 15, Illinois as a "Democratic loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 21 times, Republican 12 times, and other 1 times.
When did State Senate District 15, Illinois last vote Republican?
The most recent presidential election in which State Senate District 15, Illinois voted Republican was 1984.
How many people live in State Senate District 15, Illinois?
State Senate District 15, Illinois has a population of 474,016 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 15, Illinois?
Median household income in State Senate District 15, Illinois is $87,770 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of State Senate District 15, Illinois?
Akashic tracks 38 presidential elections in State Senate District 15, Illinois from 1876 to 2024. Of those, 21 went Democratic and 12 went Republican. The district's archetype — "Democratic loyalist" — captures the overall trajectory of that voting record.